[TwoBits]

What's the standard distance between the main units in an assassination or an Arena fight (and are they the same or different?)?

Does unit positioning make any difference? And if so, if one or both units are placed at extremes (fully forward or to the rear), what are the maximum and minimum ranges possible between the opponents?

Basically, I'm wondering what spells can and can't reach in such cases without the units moving closer.